A B C Line 1 1 1 Half tone and swelled gelatine 2-1/2 2-1/4 2 Half tone three colour (three plates required) 9 12 10-1/2 Photogravure 4-1/2 4-3/4 5 It must not be thought that if the area of a block is 3 square inches, the cost will, therefore, be 9d. There is, for obvious reasons, a minimum size at which the block or plate is charged although it may be smaller. These minima vary; in general terms they may be taken as 12 inches for line, half tone and swelled gelatine blocks, and 20 inches for half tone three colour blocks and photogravure plates. The measurements are the areas of the etched surface, the actual plate or block may be larger, but for this margin no charge is made. With regard to cost of printing, nothing need be said about blocks which are set up with the type, namely line, swelled gelatine and coarse half tone blocks. The price of printing fine half tones and three colour blocks depends upon the quality of the paper used and the fineness of the work. Photogravure plates must be hand printed (photogravure printing on rotary machines is not considered here), and skill is required; for ordinary printing on good plate paper the price would be 10s. to 12s. 6d. per hundred copies, whilst for India printing the cost would be about 25s. for the same number. LITERATURE Barnes: _Illustrating Botanical Papers_, Botanical Gazette, Vol. 43, 1907. Bock: _Zincography_, London, 1910. Cumming: _Handbook of Lithography_, London, 1904. Cundall: _A Brief History of Wood-Engraving from its Invention_, London, 1895. Gamble: _Line Photo-engraving_, London, n.d. Hamerton: _Drawing and Engraving_, London, 1892. _Etching and Etchers_, London, 1880. _The Graphic Arts_, London, 1882. Pennell: _Lithography and Lithographers_, London. Richmond: _Grammar of Lithography_, London, 1909. Robertson: _The Art of Etching_, London, 1885. Verfasser: _The Half-tone Process_, London, n.d. Wilkinson: _Photo-mechanical Processes_, London, n.d. * * * * * Transcriber's Note Some extraneous Headings on otherwise blank pages have been removed. Each Footnote has been indented and placed beneath the paragraph to which it refers. The Plates, which were on un-numbered pages, and some of the Figures, have been moved to (usually) below the paragraphs which first refer to them. page 35: 'revelant' corrected to 'relevant' ... "See also the relevant works cited under Literature" page 90: The Table of Costings does not appear to make sense, but has been left as in the original. Hyphenation is not consistent in this book.